2.1 Channel Soundbox 300 Black Speakers 3-Piece AOpen SoundBox 300 SubWoofer Speaker System General Features: Color: Black Solid 2.1 Channel Performance 12 Watt RMS Total Power SubWoofer: 6W Satellite Speakers: 3W x 2 Wooden SubWoofer with Volume Control Knob and Bass Volume Control Knob Impedance: 8 Ohms Frequency Response: 45 Hz ~ 20 KHz Magnetically Shielded Driver: SubWoofer: 3.5-inch Woofer, Satellites: 3-inch Full Range